ANALISA PERGERAKAN POLA LONGSORAN TEBING DI BELOKAN SUNGAI

Abstract

The cliff landslide process occurs due to a continuous scouring process at the bottom of the channel. The landslide pattern that occurs is strongly influenced by flow rate, channel slope, grain diameter, water level and time. The longer the flow, the longer the scouring occurs and in severe circumstances this will cause landslides. The purpose of this study was to observe changes in the water level at the turn starting from points P1 (STA 80), P2 (STA 110), P3 (STA 140), P4 (STA 170), P5 (STA 200). This research was carried out by testing experimental models in the laboratory using artificial channels with a scale model for 30 minutes of flow time to study the pattern of cliff landslides in river bends with the resulting discharge with 2 experiments, namely (Q1 = 0.15cm3 / second), (Q2 = 3.75cm3 / second). The results of this study indicate that there is considerable erosion on the outside of the channel bends. While the deposition is clearly visible on the inside of the channel bend and the narrowing of the channel on the inside of the curve with the first experiment the maximum results of scouring (2.1cm) of sediment (3cm), the second experiment getting the maximum results of scouring (2.5cm) and (3.1cm)